AIM 65 Expansion

 

AIM 65 Ports

 

The two edgeconnector expansion ports at the rear of an AIM 65 are both 22-way double sided with a pitch of 0.156".

 

They pretty much follow the same connections as the KIM-1 and SYM-1.

The following table details the connections and highlights the few differences between the three machines:

 

 Expansion Port

 

Top Side
Pin No.
Function Bottom Side
Pin No.
Function
AIM 65
(J3)
KIM-1 SYM-1 AIM 65
(J3)
KIM-1 SYM-1
1 SYNC A A0
2 RDY B A1
3 Ø1 C A2
4 IRQ D A3
5 S.O. RO RO E A4
6 NMI F A5
7 RES H A6
8 D7 J A7
9 D6 K A8
10 D5 L A9
11 D4 M A10
12 D3 N A11
13 D2 P A12
14 D1 R A13
15 D0 S A14
16 -12V K6 18 T A15
17 +12V SST OUT DBOUT U Ø2
18 CS8   POR V R/W
19 CS9   Unused W R/W
20 CSA   Unused X TEST PLL TEST AUD TEST
21 +5V Y Ø2
22 GND Z RAM R/W

 

Application Port

Likewise the Application Ports on the three machines are very similar: 

 

Top Side
Pin No.
Function Bottom Side
Pin No.
Function
AIM 65
(J1)
KIM-1 SYM-1 AIM 65
(J1)
KIM-1 SYM-1
1 GND A +5V
2 PA3 B   K0 00
3 PA2 C Ø2 K1 04
4 PA1 D R/W K2 08
5 PA4 E TAPE 1B RTN K3 0C
6 PA5 F TAPE 1B K4 10
7 PA6 H TAPE 2B RTN K5 14
8 PA7 J TAPE 2B K7 1C
9 PB0 K   DECODE ENABLE 18
10 PB1 L AUDIO IN
11 PB2 M AUDIO OUT LO
12 PB3 N +12V RCN-1 (1)
13 PB4 P AUDIO OUT HI
14 PA0 R TTY KYBD RTN(+)
15 PB7 S TTY PTR RTN(+)
16 PB5 T TTY KYBD
17 PB6 KB ROW O U TTY PTR(-)
18 CB1 KB COL F V TAPE 2A KB ROW 3
19 CB2 KB COL B W TAPE 1A KB COL G
20 CA1 KB COL E X   KB ROW 2
21 CA2 KB COL A Y SERIAL IN KB COL C
22 -12V KB COL D Z +24V KB ROW 1

 

AIM 65 Expansion Boards

 

There where probably dozens of expansion boards avaliable for the AIM 65 back in the day but I only have three !

An alternative means of expanding the AIM 65 is to add an RM Rack.

 

 

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